GF-3217: Add pre-transition management methods.
GF-3217: Add pre-transition management methods.

Arranger transition will be blocked until transitionReady become true.

Enyo-DCO-1.1-Signed-off-by: David Um <david.um@lge.com>

mcanthony/moonstone,enyojs/moonstone,mcanthony/moonstone,mcanthony/moonstone